@mixin font-size($size) {
  @if $size == small {
    font-size: 11.7px;
  }
  @else if $size == medium {
    font-size: 14px;
  }
}

@mixin material-shadow($level: light) {
  @if $level == light {
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  }@else if $level == heavy {
    box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  }@else if $level == none {
    box-shadow: none;
  }
}

@mixin transition($args...) {
  -webkit-transition: $args;
  -moz-transition: $args;
  -ms-transition: $args;
  -o-transition: $args;
  transition: $args;
}

@mixin placeholder {
  &::-webkit-input-placeholder {@content}
  &:-moz-placeholder           {@content}
  &::-moz-placeholder          {@content}
  &:-ms-input-placeholder      {@content}
}
